As divergent from the game as the manga of Phantom Hourglass was, they still did good with the scene where Linebeck is possessed by Bellum. He would rather kill himself than attack Link, and it's the only means of defiance he has.
At some point during the game, you get a letter in the mail from Linebeck. Seems strange at first since he's always travelling with Link, until the letter reveals that despite the way he usually acts, Linebeck really is grateful towards Link. He just finds it hard to actually say that to him.